The ARC and Part ML explained for owners

What an airworthiness review certificate is, how long it lasts, and who is responsible for keeping a light aircraft airworthy under Part ML.

The short answer

The airworthiness review certificate (ARC) confirms that an aircraft has had an airworthiness review and is valid for one year. Under Part ML, which covers most light aircraft in Europe, the owner is responsible for continuing airworthiness unless they contract a CAMO or CAO to take it on.

What Part ML covers

Part ML applies to aeroplanes up to 2,730 kg MTOM and other light aircraft that are not used by licensed airlines. It allows an owner declared maintenance programme and lets pilot owners carry out some simple tasks themselves.

Pilot owner maintenance

A pilot owner may do certain limited tasks listed in Part ML, such as some lubrication, tyre and simple component work, as long as the maintenance programme allows it and the work is recorded. Anything beyond that needs certifying staff.

Keeping track

The ARC date, airworthiness directives, hour and calendar limits and the next scheduled inspection all need watching. Missing one grounds the aircraft, so most owners keep them in one list with reminders.